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diff --git a/chrome/browser/net/cert_logger.proto b/chrome/browser/net/cert_logger.proto
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// This protobuffer is intended to store reports from Chrome users of
+// certificate pinning errors. A report will be sent from Chrome when it gets
+// e.g. a certificate for google.com that chains up to a root CA not expected by
+// Chrome for that origin, such as DigiNotar (compromised in July 2011), or
+// other pinning errors such as a blacklisted cert in the chain. The
+// report from the user will include the hostname being accessed, 
+// the full certificate chain (in PEM format), and the
+// timestamp of when the client tried to access the site. A response is
+// generated by the frontend and logged, including validation and error checking
+// done on the client's input data.
+
+
+syntax = "proto2";
+
+package chrome_browser_net;
+
+// Chrome requires this.
+option optimize_for = LITE_RUNTIME;
+
+// Protocol types
+message CertLoggerRequest {
+  // The hostname being accessed (required as the cert could be valid for
+  // multiple hosts, e.g. a wildcard or a SubjectAltName.
+  required string hostname = 1;
+  // The certificate chain as a series of PEM-encoded certificates, including
+  // intermediates but not necessarily the root.
+  required string cert_chain = 2;
+  // The time (in usec since the epoch) when the client attempted to access the
+  // site generating the pinning error.
+  required int64 time_usec = 3;
+};
+
+// The response sent back to the user.
+message CertLoggerResponse {
+  enum ResponseCode {
+    OK = 1;
+    MALFORMED_CERT_DATA = 2;
+    HOST_CERT_DONT_MATCH = 3;
+    ROOT_NOT_RECOGNIZED = 4;
+    ROOT_NOT_UNEXPECTED = 5;
+    OTHER_ERROR = 6;
+  };
+  required ResponseCode response = 1;
+};
+